It carries a TM120M thermal-magnetic overcurrent release, rated 125 A continuous at 40 °C through 50 °C, then derates to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C — so if your panel ambient runs hot, you need to factor that curve into your load calculation, not just the 125 A nameplate. Breaking capacity is voltage-dependent: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V.
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits most Siemens SENTRON panelboards and distribution blocks. No undervoltage release, no voltage trip indicator, no ground-fault monitoring — this is a straight thermal-magnetic breaker with no auxiliaries built in.